General GM ChatWhen starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.
Chat about all things GM (and related cars). Off-topic stuff should be in the Lounge, and all Model specific mechanical problems should be posted in the proper forum.

Okay the heater on my car is messed up..... when you turn on my heater it blows cold and sometimes it will just start blowing hot but after a few minutes it blows cold again.... why is this and what could cause it to blow cold